单项选择题
A.M820 B.M721 C.ZXONE 8500 D.ZXONE 8700
A.5~6dB B.7~9dB C.1~2dB D.9~12dB
A.STM-1 B.STM-16 C.10GE-LAN D.STM-64
A.PON B.数据 C.SDH D.PTN
微信扫一扫,加关注免费搜题
